... 1.4 inch size,USB powered fan 2.Safety net design,excellent quality 3.360 degree rotation,ultra-quiet 2011 promotion gift Power source ... , new DC brushless motor, strong wind, super quiet. 2.5V USB(cable length:1.2m) power supply, plastic shell, special mesh ... wind, cool and refreshing, comfortable. 11.USB plug and play,no external power needed,USB power adapter required for the 5V .. 1000MA ...